Tubular auger.



Patented Dec. 23, |902.

NIJ. 715,557.

H. E. KLINGENSMITH.

TUBULAR AUGER.

(Application led Sept. 3, 190:2.\

(No'Model.)

ma Nnnms Patins no. vnoomwo.. wAsmNmon. D, n.

UNTTEE STATES PATENT OEEICE.

IIIRAM E. KLINGENSMITH, OF PARNASSIIS, PENNSYLVANIA, ASSIGNOR OFONE-HALF TO SEWARD R. SEYBOLD, OF NEW KENSINGTON, PENNSYL- VANIA.

TUBULAR AUGER.

SPECIFICATION forming part of Letters Patent No. 716,557, dated December28, 1902.

Application tiled September 3, 1902. Serial No. 121,929. (No model.)

tion relates to understand its nature and to practice it in the form inwhich I prefer to employ it.

Referring to the drawings, Figure l represents in longitudinal section ahollow rotating mandrel having my improved boring-tool and mounted for asliding feed in boring. Fig. 2 shows a boring-tool in perspective. Fig.3 is a side view of the same. showing the wall connecting the wings atthe z5 auger-point. Fig. 5 is a side view of the boring-tool. Fig. 6 isa cross-section of the tool, taken below the ring-shoulder, lookingtoward the point. Fig. 7 is an end view of the tool.

The tool is designed for boring wooden pipes, pump-stocks, columns, andthe like,

and its boring or bit part is formed integral with a tubularscrew-threaded body part l,

which provides means for securing it to the end of a hollow mandrel,through which the chips are delivered from the tubular boring part, andfor this purpose the mandrel is mounted in suitable bearings for asliding boring-feed. A ring-shoulder 2 forms the base of the boring-tooland joins the tubular screw-threaded end of the hollow mandrel. From thering-shoulder a pair of cuttingwings extend in right and left spiralsand meet in a solid wall 3, the opposite sides of which are concave, asin Figs. 6, 7.

The width of each ring is preferably less than a quarter of the diameterof the tool, as in Fig. Between the wings the tool is open on bothsides, the width of the opening being 5o preferably greater than thewidth of the Fig. 4. is a section wings and extends from thering-shoulder to the meeting transverse wall 3 of the wings at thepoint. These wings are of peculiar construction and arrangement andconstitute the boring-body, each wing having a multiple of steppedcutting edges 4, extending in opposite spirals from the ring-shoulder tothe point where each wing terminates in a cutting edge 5 at rightangles, or nearly so, with a line axial to the tool. The inner walls ofthe wings are coincident with the inner walls of the attaching end ofthe tool and terminate in the solid wall 3 of the point, as in Figs. 3and 4, while the inner Walls of the screw-attaching end Iiare to theedges of the ringshoulder at each side opening, as in Figs. 5 and 7, toallow free entrance of the chips at the edges of the ring-shoulderbetween the wings. Each wing at its junction with the cutting edges 5 5of the point is formed with a cutting edge 6 6, substantially parallelwith the axis of the tool, the outer surface joining these parallelcutting edges being convex, and the diameter of the tool -at theseparallel cutting edges is about one-half that of the interior of thescrew end.

The Wings have a right and left oblique relation their fullv length toeach other and to thevaxis of the tool so that the cutting edge of eachwing stands oblique to a line axial with the tool, as in Figs. 5 and 7.The outer convex surface of each Wingis stepped, each step forming aspiral shoulder 7, which forms a right-angle chisel-cutter 8 at itsjunction with the oblique cutting edge 4, and it will be understood thatthis stepped cutting edge is the forward edge of each wing in the boringoperation. These stepped cutting edges 4. extend from the ring-shoulderand are continuous with the cutting edges 6 6 of the 9a point and form aplurality of cutters, the oblique cutting edge of each joining the nextoblique cutting edge by a chisel-cutter 8 at right angles Substantiallyto the axis of the tool, the surface between the shoulders be` ingsubstantially parallel with the axis of the tool. This constructiongives an oblique cutting edge 4, interrupted with chisel-cutters 8, eachcutter delivering the chips through the side openings into the tubularneck of the 10:

tool.

The conveX surface of each cutter may diminish in width from the obliquecutting edges to the noncuttiug edges of the wings, thereby giving asort of clearance for the spiral shoulders 7 in the working of the tool,as in Fig. 5.

Looking at Fig. 7, the stepped form of the oblique cutting edges areseen as starting from the augerpoint, each step forming a chisel-edge 4,the convex surface of all the cutters being concentric. In Fig. 6 isseen the novel relation to each other of the stepped chisel-cutters tothe wings, to the opening formed between the cutting edges of the wings,and to the point-wall connecting the wings.

The mandrel 9 is rotated by a pulley 10, splined thereon between fixedbearings 1l 11, while a screw-shaft 12, mounted in the supporting-frame,effects the feed of the mandrel by means of the slidable bearing 17,which engages the screw-shaft, which is operated by suitable gearing 18.The fixed bearings give a firm support to the boring end of the mandrel,while the slidable bearing engages the mandrel by collars and serves todrive the auger by the feed-screw.

For facilitating the delivery of the chips from the boring-tool throughthe mandrel I place a tube 13 therein, with its open end 14 at or nearthe screw end of the boring-tool, whereby air under pressure isdelivered at this point into the mandrel and forces the chips out. Forthis purpose the outer end of this blow-tube is connected with ailexible tube 15, which is supplied with air under pressure or withsteam in any suitable Way. The air-tube rests upon the innerwalls of themandrel and is connected to the outer end of the latter, so as to movelongitudinally with the mandrel, but does not rotate with it. Suchconnection is by a bracket 16 at the open end of the mandrel, so as notto obstruct the delivery.

The wall 3 stands across and connects the wings and is formed with aleading-screw, which, with the cutters 5 5, forms the augerpoint, theconcave sides of the wall terminating in the cutters 6 6, giving theboring action of the auger-point. Itis important to note that thecutters 8 by the spiral right and left relation of the wings to eachother give a draw-knife cut and lessen the resistance to the cuttingaction from the least to the greatest diameter of the tool. The joiningof the oblique with the spiral gives the free entering point to thecutter 4.

In the delivery of the chips from the boringtool into the mandrel thefollowing structural elements cooperate the right and left twist of thewings, as seen in Figs. 5, 6, and 7, the concave form of the inner wallsof the wings from the cutting edge, as in Fig. 6, the outward flaring ofthese walls through the screw end, as seen by the dotted lines 19 inFig. 3, and the inward flaring of the inner walls of the ring-shoulderat the openings between the wings to a circumferential edge, as seen inFig. 5 by the dotted lines 20. This outward-forced feed of the chipsstarts from the cutters 6 6, which have a twisted relation to theconcave sides of the point-Wall, and from both sides of thiswall thechips are directed into the openings between the wings.

The wings form a conical cutter, and each wing diminishes in width fromthe tubular body of the boring-point, while the openings between thewings increase in width from the point-wall to the tubular body, and asthe wall 3 is concave on its opposite sides the openin g between the wings receives the chips from each side of the wall, by reason of thespiral form of the cutters 6, one formed by each concave side of thewall, as seen in Figs. 2 and 3. The spiral concavity of the wallsbetween the point-cutters 6 6, the outward flaring of the openingbetween the wings from the wall 3, and the inward flare of the innerwalls of the tubular body at the openings between the wings cooperate toeifect the free discharge of the chips from the point with a forcedfeed.

I claim-- 1. A boring-tool consisting of a tubular body formed with apair of wings projecting therefrom in right and left oblique relation toeach other and to the axis of the tool, open at each side and meeting ina cutting-point, each wing having a plurality of oblique cutting edgesextending from the body to the point.

2. A boring-tool consisting of a tubular body, a pair of outer wingshaving oblique relation to each other, forming a cone open at itsopposite sides and meeting in a transverse wall having concave opensides, and end and side cutters.

3. A boring-tool consisting of a tubular body, a pair of cutter-wingshaving oblique relation to each other and formed with the body, open atopposite sides, meeting in a cutting-point formed by a transverse wallhaving concave sides terminating in end and side cutters and having amediate leadingscrew point.

4. A boring-tool consisting of a tubular body, a pair of cutter-wingsformed therewith and having oblique relation to each other, open atopposite sides and meeting in a cutting-point, the inner walls of thewings Haring outward from the cutting-point, the inner walls of thetubular body flaring inward at the side openings, whereby the chips arecaused to have a free forced feed from the tubular body.

5. A boringtool formed of a tubular body, a pair of wings projectingtherefrom in spiral relation to each other and meeting at theboringpoint in a transverse wall, each wing forming a plurality ofcutting edges which terminate in side and end cutters in the transversewall.

6. A boring-tool formed integral with a tubular screw-threaded body, aboring-point IOO IIC

comprising a Wall of parallel sides, each side expanded concave andformed with a side cutting edge joining an end cutting edge, a pair ofWings extending from the tubular body in right and left relation to eachother and terminating in the parallel concave Walls of the boring-point,each wing having a cutting edge extending in spiral relation to eachother from the tubular body to the end cutter'.

7. A boring-tool formed or" a tubular body, a pair of cutting-Wingsextending from the body to the point in oblique relation to each other,each Wing. formed with a plurality of cutting edges and external spiralshoulders the Width between the shoulders diminishing from the cuttingto the non-cutting edge of the wing. H t

8. A boring-tool consisting ot' a tubular body formed With a pair ofcutter-wings projecting therefrom in right and left oblique relation toeach other, a boring-point formed with a middle Wall the opposite sidesof Which are concave and terminate each in an end and a side cutter, theopening between the wings flaring from the point-Wall and the innerWalls of the tubular body flaring at the open sides of the tool towardthe point-wall.

In testimony whereof I affix my signature in presence of two witnesses.

HIRAM E. KLINGENSMITH.

Witnesses:

HARRY C. WALLEY, ST. CLAIR WILLIAMS.

